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Questions about natural stones

I've just recently gootten into using natural finishing stones. It's been hard to find information on them though. I was wondering what it means when a
Stone has a toxic line. I'm assuming it doesn't litterally mean toxic but I really have no idea. I bought I a stone on eBay that seemed like a really good deal and right after I bought it I noticed it said it had a toxic line. Was it a bad buy?

All normal people love meat. If I went to a barbeque and there was no meat, I would say 'Yo Goober! Where's the meat?'.- Homer Simpson

Somone more experienced may correct me if I'm wrong, but I'm pretty sure that a 'toxic line' refers to an inclusion in the stone that is harder than the surrounding stone, and can therefore scratch the finish of a knife whilst polishing. They can sometimes be 'scratched out' of the stone using a hard carbide point.

Maxim's JNS wiki is a great place to start reading about jnats, but I'm not sure if those articles cover this issue or not.

I guess you should just try out the stone on a knife that you don't mind getting scratched first to work out how harsh the inclusion is.

One of my stones has a toxic line, it is not really a big issue on my stone. The line does not wear as quickly as the rest of stone, so I have to occasionally cut the line out with an Xacto when the stone wears to the line.